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Paste raw or minified JSON and instantly get clean, indented output with configurable spacing (2 spaces, 4 spaces, or tabs). Sort keys alphabetically, minify for production, or beautify for readability. Powered by the Monaco editor, the same engine behind VS Code.
Real-time validation highlights errors inline as you type, with human-readable messages like “Missing comma after line 12” instead of cryptic parser output. The status bar shows validity, line count, and file size at a glance.
Struct can automatically repair trailing commas, single-quoted strings, unquoted keys, JavaScript comments (// and /* */), and missing closing brackets. One click to fix all issues and format the result.
A collapsible tree view shows your JSON structure alongside the editor. Click a node to jump to that line; click a line to highlight the node. Filter by data type, search with regex, limit depth, and navigate matches with keyboard shortcuts.
Compare two JSON documents side by side. Semantic mode ignores key reordering and whitespace changes, highlighting only actual value differences. Summary stats show additions, removals, and changes at a glance.
When you paste JSON, Struct silently scans for patterns that look like API keys, AWS credentials, database passwords, and auth tokens. If secrets are found, a warning explains that on competitor sites this data would be sent to their servers. The quality score rates your JSON 0–100 across formatting, naming, structure, types, and efficiency.
A JSON formatter takes raw or minified JSON and restructures it with proper indentation, line breaks, and syntax highlighting to make it human-readable. Struct formats JSON instantly in your browser using the Monaco editor (the same engine behind VS Code) with configurable indentation options.
Most online JSON formatters send your data to their servers for processing. In November 2025, researchers found that the top two JSON formatting sites had been leaking over 80,000 sensitive files for five years. Struct is different: all processing happens 100% in your browser. Your data never leaves your device. You can verify this by disconnecting your network and confirming Struct still works.
Paste your JSON into Struct and validation happens automatically. Errors are highlighted inline with human-readable messages like “Missing comma after line 12” instead of cryptic parser output. The status bar shows validity, line count, and file size at a glance. For common errors like trailing commas or single quotes, click “Fix All” to repair everything in one step.
Every feature runs entirely in your browser. Nothing is sent to any server. You can verify this by using Struct with your network disconnected. Read our privacy policy for full details.
Yes. All core features (formatting, validation, tree view, diff, secret scanning, and quality scoring) are 100% free with no signup required.
Your data never leaves your browser. All processing is 100% client-side. Nothing is sent to any server. This is verifiable: disconnect your network and Struct still works. See our privacy policy.
Trailing commas, single-quoted strings, unquoted keys, JavaScript comments (// and /* */), and missing closing brackets. Click “Fix All” to repair everything in one step.
Struct processes data 100% client-side (your data never touches a server), uses the Monaco editor (same as VS Code), and includes an interactive tree explorer, semantic JSON diff, secret/API key detection, structural linting, and quality scoring. Features most formatters lack.
Yes. Once the page loads, all core features work without an internet connection because processing happens entirely in your browser.